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<a href="random_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright 2023 Akamai Technologies, Inc.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Licensed under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * &quot;License&quot;); you may not use this file except in</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * compliance with the License.  You may obtain a copy</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of the License at</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *   https://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> *</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * Unless required by applicable law or agreed to in</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * writing, software distributed under the License is</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * See the License for the specific language governing</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * permissions and limitations under the License. */</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"></span><span class="preprocessor">#pragma once</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span> </div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="preprocessor">#include &quot;<a class="code" href="util__fwd_8hpp.html">flow/util/util_fwd.hpp</a>&quot;</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="preprocessor">#include &lt;boost/random.hpp&gt;</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="preprocessor">#include &lt;limits&gt;</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span> </div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceflow_1_1util.html">flow::util</a></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span>{</div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span><span class="comment"></span> </div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="comment">/**</span></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span><span class="comment"> * Base class for Rnd_gen_uniform_range and Rnd_gen_uniform_range_mt for various aliases and similar, so</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span><span class="comment"> * template arguments need not be involved.</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span><span class="comment"> */</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Rnd__gen__uniform__range__base.html">   32</a></span><span class="keyword">class </span><a class="code hl_class" href="classflow_1_1util_1_1Rnd__gen__uniform__range__base.html">Rnd_gen_uniform_range_base</a></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span>{</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span><span class="keyword">public</span>:</div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span>  <span class="comment">// Types.</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span><span class="comment"></span> </div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span><span class="comment">   * The random generator engine; it is public for the reason explained in Usability section of the</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span><span class="comment">   * Rnd_gen_uniform_range doc header.</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span><span class="comment">   */</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Rnd__gen__uniform__range__base.html#a519fc83fd1c52a82618cd85f3a089668">   41</a></span>  <span class="keyword">using </span><a class="code hl_typedef" href="classflow_1_1util_1_1Rnd__gen__uniform__range__base.html#a519fc83fd1c52a82618cd85f3a089668">Random_generator</a> = boost::random::mt19937;</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span>};</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span><span class="comment"></span> </div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span><span class="comment">/**</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span><span class="comment"> * Simple, non-thread-safe uniform-range random number generator.  This merely wraps the perfectly nice, advanced</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span><span class="comment"> * random number generation facilities for this common, simple use case.</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span><span class="comment"> *</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span><span class="comment"> * ### Thread safety ###</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span><span class="comment"> * The random number generation itself is not safe for concurrent invocation on the same `this`.</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span><span class="comment"> * Use Rnd_gen_uniform_range_mt if this is not acceptable.</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span><span class="comment"> *</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span><span class="comment"> * ### Usability, performance discussion ###</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span><span class="comment"> * This class is hopefully appealingly simple; but please note that if you are using N=2+ instances of it for N</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="comment"> * different uniform ranges (let alone other distributions), you could instead use boost.random directly: namely</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="comment"> * institute a single RNG and then generate values against various distributions from that shared RNG.  In particular,</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span><span class="comment"> * this would require only one seed (arguably increases code simplicity in that respect); and might be faster</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span><span class="comment"> * since there is one raw RNG engine instead of N (as would be the case if one used N `Rnd_gen_uniform_range`s).</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span><span class="comment"> *</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span><span class="comment"> * If one chooses to do as suggested in the previous paragraph, Rnd_gen_uniform_range_base::Random_generator is a good</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span><span class="comment"> * choice for the RNG itself (but of course one is free to use another one, if this one&#39;s mathematical/perf properties</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span><span class="comment"> * are not acceptable).</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span><span class="comment"> *</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span><span class="comment"> * @tparam range_t</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="comment"> *         Type of values generated; must be suitable for `boost::random::uniform_int_distribution`.</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span><span class="comment"> *</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span><span class="comment"> * @todo Rnd_gen_uniform_range and Rnd_gen_uniform_range_mt, on reflection, are very similar to</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span><span class="comment"> * `boost::random::random_number_generator`, and should be written to conform to it, so as to be usable in</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span><span class="comment"> * `std::random_shuffle()`, and also to gain its appealing extra features without losing any of the already-available</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span><span class="comment"> * simplicity.  Note, however, that `std::random_shuffle()` is deprecated (and gone in C++17) in favor of</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span><span class="comment"> * `std::shuffle()`, which is available from C++11 on, and which works directly with a formal URNG</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span><span class="comment"> * such as Rnd_gen_uniform_range_base::Random_generator.  So this to-do is less about that and more about gaining</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span><span class="comment"> * those other features while being suitable for `random_shuffle()`, which some code does still use out there.</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span><span class="comment"> *</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span><span class="comment"> * @internal</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span><span class="comment"> *</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span><span class="comment"> * Regarding the above to-do: Here is how `boost::random::random_number_generator` differs from this class and</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span><span class="comment"> * the implications:</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span><span class="comment"> *   - It accepts a URNG as a template arg.  We should do that too while defaulting to</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span><span class="comment"> *     Rnd_gen_uniform_range_base::Random_generator.</span></div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span><span class="comment"> *   - It accepts a URNG reference as a ctor arg.  We should do that too while also providing a ctor that causes us to</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span><span class="comment"> *     create our own, like now; in the latter case we would pass the ctor `seed` arg into it.  In the former case</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span><span class="comment"> *     it should invoke `URNG.seed()` to set the seed while requiring that URNG is a</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span><span class="comment"> *     boost.random PseudoRandomNumberGenerator (so that it can take `.seed()`).  Do note that taking a seed this way</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span><span class="comment"> *     is an added feature we have.</span></div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span><span class="comment"> *   - Its `operator()` accepts N and returns a value in [0, N - 1], whereas ours takes no args and returns</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span><span class="comment"> *     something in the range [min, max] given in ctor.  We must (in order to conform to what</span></div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span><span class="comment"> *     `std::random_shuffle()` expects) provide what they provide; but we should also feature two more `operator()`</span></div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span><span class="comment"> *     overloads:</span></div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span><span class="comment"> *     - No-args: Same as now.</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span><span class="comment"> *     - Two args min, max: Return from [min, max].</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span><span class="comment"> *   - It is interesting that its implementation as of Boost 1.76.0 (at least) creates a new equivalent of</span></div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span><span class="comment"> *     #m_seq in *each* `operator()` call.  Is that slower than our impl?  However, since no one is screaming about</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span><span class="comment"> *     its slowness, maybe we should conclude the way they do it is fine; and it does have an advantage:</span></div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span><span class="comment"> *     one can implement the non-zero-arg `operator()` trivially.  Perhaps we should do what they do for the</span></div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span><span class="comment"> *     non-zero-arg overloads; while doing what we do for the zero-arg one.</span></div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span><span class="comment"> *</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span><span class="comment"> * Lastly we also provide Rnd_gen_uniform_range_mt, which is a feature they lack, and we can trivially extend it</span></div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span><span class="comment"> * to cover all of the above suggested changes.</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span><span class="comment"> */</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> range_t&gt;</div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html">  101</a></span><span class="keyword">class </span><a class="code hl_class" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html">Rnd_gen_uniform_range</a> :</div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span>  <span class="keyword">public</span> <a class="code hl_class" href="classflow_1_1util_1_1Rnd__gen__uniform__range__base.html">Rnd_gen_uniform_range_base</a>,</div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span>  <span class="keyword">private</span> boost::noncopyable</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span>{</div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span><span class="keyword">public</span>:</div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span>  <span class="comment">// Constuctors/destructor.</span></div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span><span class="comment"></span> </div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span><span class="comment">   * Begins the random number generation sequence.  Current time is used as the seed.</span></div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span><span class="comment">   *</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span><span class="comment">   * @param min</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span><span class="comment">   *        Generated numbers will be in range `[min, max]`.</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span><span class="comment">   * @param max</span></div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span><span class="comment">   *        See `min`.</span></div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span><span class="comment">   */</span></div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#a8c6bb1d53f7e1aea58d21091ba37e9ae">  116</a></span>  <a class="code hl_function" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#a8c6bb1d53f7e1aea58d21091ba37e9ae">Rnd_gen_uniform_range</a>(range_t min = 0, range_t max = std::numeric_limits&lt;range_t&gt;::max());</div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span><span class="comment"></span> </div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span><span class="comment">   * Begins the random number generation sequence.  Seed is to be given as an argument.</span></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span><span class="comment">   *</span></div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span><span class="comment">   * @param min</span></div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span><span class="comment">   *        Generated numbers will be in range `[min, max]`.</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span><span class="comment">   * @param max</span></div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span><span class="comment">   *        See `min`.</span></div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span><span class="comment">   * @param seed</span></div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span><span class="comment">   *        Seed.  Supply the same value to yield the same sequence repeatedly.</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span><span class="comment">   */</span></div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#a7470837dde6dbb38691b4bb7ecf93472">  128</a></span>  <a class="code hl_function" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#a7470837dde6dbb38691b4bb7ecf93472">Rnd_gen_uniform_range</a>(uint32_t seed, range_t min, range_t max);</div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span> </div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span>  <span class="comment">// Methods.</span></div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span><span class="comment"></span> </div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span><span class="comment">   * Returns the next pseudo-random number in `[min, max]` provided in constructor.</span></div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span><span class="comment">   * Not thread-safe for a given `this`.</span></div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span><span class="comment">   *</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span><span class="comment">   * @return Ditto.</span></div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span><span class="comment">   */</span></div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#a579080b18b6c95d49039a5098afe707b">  138</a></span>  range_t <a class="code hl_function" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#a579080b18b6c95d49039a5098afe707b">operator()</a>();</div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span> </div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span><span class="keyword">private</span>:</div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span>  <span class="comment">// Data.</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span><span class="comment"></span> </div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span><span class="comment">  /// Random number generator engine.</span></div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#a04d93d9b272f9896ad99f33cf76cf67d">  144</a></span><span class="comment"></span>  <a class="code hl_typedef" href="classflow_1_1util_1_1Rnd__gen__uniform__range__base.html#a519fc83fd1c52a82618cd85f3a089668">Random_generator</a> <a class="code hl_variable" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#a04d93d9b272f9896ad99f33cf76cf67d">m_gen</a>;<span class="comment"></span></div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span><span class="comment">  /// Uniform-distribution sequence in `[min, max]` backed by #m_gen.</span></div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#ac216ad57ff7d9a116bc13b71510231bf">  146</a></span><span class="comment"></span>  boost::random::uniform_int_distribution&lt;range_t&gt; <a class="code hl_variable" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#ac216ad57ff7d9a116bc13b71510231bf">m_seq</a>;</div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span>}; <span class="comment">// class Rnd_gen_uniform_range</span></div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span><span class="comment"></span> </div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span><span class="comment">/**</span></div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span><span class="comment"> * Identical to Rnd_gen_uniform_range but safe for concurrent RNG given a single object.</span></div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span><span class="comment"> *</span></div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span><span class="comment"> * @tparam range_t</span></div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span><span class="comment"> *         Same as for Rnd_gen_uniform_range.</span></div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span><span class="comment"> */</span></div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> range_t&gt;</div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Rnd__gen__uniform__range__mt.html">  156</a></span><span class="keyword">class </span><a class="code hl_class" href="classflow_1_1util_1_1Rnd__gen__uniform__range__mt.html">Rnd_gen_uniform_range_mt</a> :</div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span>  <span class="keyword">private</span> <a class="code hl_class" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html">Rnd_gen_uniform_range</a>&lt;range_t&gt;</div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span>{</div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span><span class="keyword">public</span>:</div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span>  <span class="comment">// Constructors/destructor.</span></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span> </div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span>  <span class="comment">// Delegate the exact constructors from Rnd_gen_uniform_range.</span></div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span>  <span class="keyword">using </span><a class="code hl_class" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html">Rnd_gen_uniform_range</a>&lt;range_t&gt;<a class="code hl_function" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#a8c6bb1d53f7e1aea58d21091ba37e9ae">::Rnd_gen_uniform_range</a>;</div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span> </div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span>  <span class="comment">// Methods.</span></div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span><span class="comment"></span> </div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span><span class="comment">   * Returns the next pseudo-random number in `[min, max]` provided in constructor.</span></div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span><span class="comment">   * Thread-safe for a given `this`.</span></div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span><span class="comment">   *</span></div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span><span class="comment">   * @return Ditto.</span></div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span><span class="comment">   */</span></div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Rnd__gen__uniform__range__mt.html#ae9a26e2e155c9f24bcef57bd9404eca3">  173</a></span>  range_t <a class="code hl_function" href="classflow_1_1util_1_1Rnd__gen__uniform__range__mt.html#ae9a26e2e155c9f24bcef57bd9404eca3">operator()</a>();</div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span> </div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno">  175</span><span class="keyword">private</span>:</div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno">  176</span>  <span class="comment">// Data.</span></div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span><span class="comment"></span> </div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno">  178</span><span class="comment">  /// Mutex that protects against concurrency-based corruption.</span></div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Rnd__gen__uniform__range__mt.html#add632fccb79ec2178b9d2250ae0fef54">  179</a></span><span class="comment"></span>  <a class="code hl_typedef" href="namespaceflow_1_1util.html#add6ade273326f27eaf9bfd170a909626">flow::util::Mutex_non_recursive</a> <a class="code hl_variable" href="classflow_1_1util_1_1Rnd__gen__uniform__range__mt.html#add632fccb79ec2178b9d2250ae0fef54">m_mutex</a>;</div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span>};</div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno">  181</span> </div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span><span class="comment">// Template implementations.</span></div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno">  183</span> </div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> range_t&gt;</div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#a7470837dde6dbb38691b4bb7ecf93472">  185</a></span><a class="code hl_function" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#a8c6bb1d53f7e1aea58d21091ba37e9ae">Rnd_gen_uniform_range&lt;range_t&gt;::Rnd_gen_uniform_range</a>(uint32_t seed, range_t min, range_t max) :</div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno">  186</span>  m_gen(static_cast&lt;typename decltype(m_gen)::result_type&gt;(seed)),</div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno">  187</span>  m_seq(min, max)</div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno">  188</span>{</div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno">  189</span>  <span class="comment">// Nothing else.</span></div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno">  190</span>}</div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno">  191</span> </div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno">  192</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> range_t&gt;</div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#a579080b18b6c95d49039a5098afe707b">  193</a></span>range_t <a class="code hl_function" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#a579080b18b6c95d49039a5098afe707b">Rnd_gen_uniform_range&lt;range_t&gt;::operator()</a>()</div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno">  194</span>{</div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno">  195</span>  <span class="keywordflow">return</span> m_seq(m_gen);</div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno">  196</span>}</div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno">  197</span> </div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno">  198</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> range_t&gt;</div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#a8c6bb1d53f7e1aea58d21091ba37e9ae">  199</a></span><a class="code hl_function" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#a8c6bb1d53f7e1aea58d21091ba37e9ae">Rnd_gen_uniform_range&lt;range_t&gt;::Rnd_gen_uniform_range</a>(range_t min, range_t max) :</div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno">  200</span>  <a class="code hl_class" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html">Rnd_gen_uniform_range</a>(static_cast&lt;unsigned int&gt;(<a class="code hl_namespace" href="namespaceflow.html">flow</a>::util::<a class="code hl_function" href="namespaceflow_1_1util.html#ad92ad411feccf73908abe6ed130d48f5">time_since_posix_epoch</a>().count()), min, max)</div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno">  201</span>{</div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno">  202</span>  <span class="comment">// Nothing else.</span></div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno">  203</span>}</div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno">  204</span> </div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno">  205</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> range_t&gt;</div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno"><a class="line" href="classflow_1_1util_1_1Rnd__gen__uniform__range__mt.html#ae9a26e2e155c9f24bcef57bd9404eca3">  206</a></span>range_t <a class="code hl_function" href="classflow_1_1util_1_1Rnd__gen__uniform__range__mt.html#ae9a26e2e155c9f24bcef57bd9404eca3">Rnd_gen_uniform_range_mt&lt;range_t&gt;::operator()</a>()</div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno">  207</span>{</div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno">  208</span>  <a class="code hl_typedef" href="namespaceflow_1_1util.html#a5d2247b715da63e4b960909561b90ae7">Lock_guard</a>&lt;<span class="keyword">decltype</span>(m_mutex)&gt; lock(m_mutex);</div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno">  209</span>  <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span><a class="code hl_class" href="classflow_1_1util_1_1Rnd__gen__uniform__range.html">Rnd_gen_uniform_range&lt;range_t&gt;</a>&amp;<span class="keyword">&gt;</span>(*this)();</div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno">  210</span>}</div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno">  211</span> </div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno">  212</span>} <span class="comment">// namespace flow::util</span></div>
<div class="ttc" id="aclassflow_1_1util_1_1Rnd__gen__uniform__range__base_html"><div class="ttname"><a href="classflow_1_1util_1_1Rnd__gen__uniform__range__base.html">flow::util::Rnd_gen_uniform_range_base</a></div><div class="ttdoc">Base class for Rnd_gen_uniform_range and Rnd_gen_uniform_range_mt for various aliases and similar,...</div><div class="ttdef"><b>Definition:</b> <a href="random_8hpp_source.html#l00032">random.hpp:33</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Rnd__gen__uniform__range__base_html_a519fc83fd1c52a82618cd85f3a089668"><div class="ttname"><a href="classflow_1_1util_1_1Rnd__gen__uniform__range__base.html#a519fc83fd1c52a82618cd85f3a089668">flow::util::Rnd_gen_uniform_range_base::Random_generator</a></div><div class="ttdeci">boost::random::mt19937 Random_generator</div><div class="ttdoc">The random generator engine; it is public for the reason explained in Usability section of the Rnd_ge...</div><div class="ttdef"><b>Definition:</b> <a href="random_8hpp_source.html#l00041">random.hpp:41</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Rnd__gen__uniform__range__mt_html"><div class="ttname"><a href="classflow_1_1util_1_1Rnd__gen__uniform__range__mt.html">flow::util::Rnd_gen_uniform_range_mt</a></div><div class="ttdoc">Identical to Rnd_gen_uniform_range but safe for concurrent RNG given a single object.</div><div class="ttdef"><b>Definition:</b> <a href="random_8hpp_source.html#l00156">random.hpp:158</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Rnd__gen__uniform__range__mt_html_add632fccb79ec2178b9d2250ae0fef54"><div class="ttname"><a href="classflow_1_1util_1_1Rnd__gen__uniform__range__mt.html#add632fccb79ec2178b9d2250ae0fef54">flow::util::Rnd_gen_uniform_range_mt::m_mutex</a></div><div class="ttdeci">flow::util::Mutex_non_recursive m_mutex</div><div class="ttdoc">Mutex that protects against concurrency-based corruption.</div><div class="ttdef"><b>Definition:</b> <a href="random_8hpp_source.html#l00179">random.hpp:179</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Rnd__gen__uniform__range__mt_html_ae9a26e2e155c9f24bcef57bd9404eca3"><div class="ttname"><a href="classflow_1_1util_1_1Rnd__gen__uniform__range__mt.html#ae9a26e2e155c9f24bcef57bd9404eca3">flow::util::Rnd_gen_uniform_range_mt::operator()</a></div><div class="ttdeci">range_t operator()()</div><div class="ttdoc">Returns the next pseudo-random number in [min, max] provided in constructor.</div><div class="ttdef"><b>Definition:</b> <a href="random_8hpp_source.html#l00206">random.hpp:206</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Rnd__gen__uniform__range_html"><div class="ttname"><a href="classflow_1_1util_1_1Rnd__gen__uniform__range.html">flow::util::Rnd_gen_uniform_range</a></div><div class="ttdoc">Simple, non-thread-safe uniform-range random number generator.</div><div class="ttdef"><b>Definition:</b> <a href="random_8hpp_source.html#l00101">random.hpp:104</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Rnd__gen__uniform__range_html_a04d93d9b272f9896ad99f33cf76cf67d"><div class="ttname"><a href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#a04d93d9b272f9896ad99f33cf76cf67d">flow::util::Rnd_gen_uniform_range::m_gen</a></div><div class="ttdeci">Random_generator m_gen</div><div class="ttdoc">Random number generator engine.</div><div class="ttdef"><b>Definition:</b> <a href="random_8hpp_source.html#l00144">random.hpp:144</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Rnd__gen__uniform__range_html_a579080b18b6c95d49039a5098afe707b"><div class="ttname"><a href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#a579080b18b6c95d49039a5098afe707b">flow::util::Rnd_gen_uniform_range::operator()</a></div><div class="ttdeci">range_t operator()()</div><div class="ttdoc">Returns the next pseudo-random number in [min, max] provided in constructor.</div><div class="ttdef"><b>Definition:</b> <a href="random_8hpp_source.html#l00193">random.hpp:193</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Rnd__gen__uniform__range_html_a7470837dde6dbb38691b4bb7ecf93472"><div class="ttname"><a href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#a7470837dde6dbb38691b4bb7ecf93472">flow::util::Rnd_gen_uniform_range::Rnd_gen_uniform_range</a></div><div class="ttdeci">Rnd_gen_uniform_range(uint32_t seed, range_t min, range_t max)</div><div class="ttdoc">Begins the random number generation sequence.</div><div class="ttdef"><b>Definition:</b> <a href="random_8hpp_source.html#l00185">random.hpp:185</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Rnd__gen__uniform__range_html_a8c6bb1d53f7e1aea58d21091ba37e9ae"><div class="ttname"><a href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#a8c6bb1d53f7e1aea58d21091ba37e9ae">flow::util::Rnd_gen_uniform_range::Rnd_gen_uniform_range</a></div><div class="ttdeci">Rnd_gen_uniform_range(range_t min=0, range_t max=std::numeric_limits&lt; range_t &gt;::max())</div><div class="ttdoc">Begins the random number generation sequence.</div><div class="ttdef"><b>Definition:</b> <a href="random_8hpp_source.html#l00199">random.hpp:199</a></div></div>
<div class="ttc" id="aclassflow_1_1util_1_1Rnd__gen__uniform__range_html_ac216ad57ff7d9a116bc13b71510231bf"><div class="ttname"><a href="classflow_1_1util_1_1Rnd__gen__uniform__range.html#ac216ad57ff7d9a116bc13b71510231bf">flow::util::Rnd_gen_uniform_range::m_seq</a></div><div class="ttdeci">boost::random::uniform_int_distribution&lt; range_t &gt; m_seq</div><div class="ttdoc">Uniform-distribution sequence in [min, max] backed by m_gen.</div><div class="ttdef"><b>Definition:</b> <a href="random_8hpp_source.html#l00146">random.hpp:146</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html"><div class="ttname"><a href="namespaceflow_1_1util.html">flow::util</a></div><div class="ttdoc">Flow module containing miscellaneous general-use facilities that don't fit into any other Flow module...</div><div class="ttdef"><b>Definition:</b> <a href="basic__blob_8hpp_source.html#l00028">basic_blob.hpp:29</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_a5d2247b715da63e4b960909561b90ae7"><div class="ttname"><a href="namespaceflow_1_1util.html#a5d2247b715da63e4b960909561b90ae7">flow::util::Lock_guard</a></div><div class="ttdeci">boost::unique_lock&lt; Mutex &gt; Lock_guard</div><div class="ttdoc">Short-hand for advanced-capability RAII lock guard for any mutex, ensuring exclusive ownership of tha...</div><div class="ttdef"><b>Definition:</b> <a href="util__fwd_8hpp_source.html#l00265">util_fwd.hpp:265</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_ad92ad411feccf73908abe6ed130d48f5"><div class="ttname"><a href="namespaceflow_1_1util.html#ad92ad411feccf73908abe6ed130d48f5">flow::util::time_since_posix_epoch</a></div><div class="ttdeci">boost::chrono::microseconds time_since_posix_epoch()</div><div class="ttdoc">Get the current POSIX (Unix) time as a duration from the Epoch time point.</div><div class="ttdef"><b>Definition:</b> <a href="util_8cpp_source.html#l00147">util.cpp:147</a></div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_add6ade273326f27eaf9bfd170a909626"><div class="ttname"><a href="namespaceflow_1_1util.html#add6ade273326f27eaf9bfd170a909626">flow::util::Mutex_non_recursive</a></div><div class="ttdeci">boost::mutex Mutex_non_recursive</div><div class="ttdoc">Short-hand for non-reentrant, exclusive mutex. (&quot;Reentrant&quot; = one can lock an already-locked-in-that-...</div><div class="ttdef"><b>Definition:</b> <a href="util__fwd_8hpp_source.html#l00215">util_fwd.hpp:215</a></div></div>
<div class="ttc" id="anamespaceflow_html"><div class="ttname"><a href="namespaceflow.html">flow</a></div><div class="ttdoc">Catch-all namespace for the Flow project: A collection of various production-quality modules written ...</div><div class="ttdef"><b>Definition:</b> <a href="async__fwd_8hpp_source.html#l00074">async_fwd.hpp:75</a></div></div>
<div class="ttc" id="autil__fwd_8hpp_html"><div class="ttname"><a href="util__fwd_8hpp.html">util_fwd.hpp</a></div></div>
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